Added some documentation; cleaned up some memory management in map_info.cpp
Added some documentation; cleaned up some memory management in
map_info.cpp

iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate